Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9ff5569ea1f9ef…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 11:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31e49a56afdac948d2f795f69be16460 SHA-1: 2cfb0f2cdbe20047422964c1d606ebd5a84d63d8 SHA-256: 3c9ff5569ea1f9efffed3310a023d10e193d0701bb52638dd9113c2e9befb8ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the URL used in the heuristic firing. The presence of numerous links to external PDFs, many of which are benign, suggests a link farm or SEO poisoning tactic to increase visibility for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=cara+block+pop+up+di+chrome+android In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_61dc039615f94bcd81525e48d6b394d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b56239_a6e631a87284442086707dddbd31414e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_41dbeb698bd24e83b59ff60dc4f5f003.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9ea9b6_82a7181b8dc342a5a5b9a1d38922a1b0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_5caa6fcab1b8404dabd3089ca940885f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/238140_785e4278e8e8445e90ce8c6fed6460ee.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_aed35aa1fc134d989308ae735df3f3d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b24d0f4f2f92465e83538cb48651541f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/vimigipogidegosinimazovib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/physics_books_for_jee_advanced.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2491/5359/files/breast_cancer_questionnaire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/givugixorusojemomotiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/income_tax_fundamentals_2015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/antioxidant_activity_methods.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B81 5244 bytes
SHA-256: 6ce33c76f58e364b7c2a01943a6fcdb36aee45d780fa3dc920c0db8f32baa212
font_01_sfnt_off00006d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D22 11408 bytes
SHA-256: 3ae91c33606ca20ea4ffcb88dd7ad2d60efe2568a4e71dd37e9a2ec5c2975c81
font_02_sfnt_off0000919e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919E 16084 bytes
SHA-256: d21a7fc198e2dbcb9b040cb75dab8cf98619bf1634d79e1d2b6cd60f14bc1e82

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